Mattress border



FIG. 1 is a right top perspective view of a mattress border showing theinvention;

FIG. 2 is a right side elevational view of the mattress border of FIG.1, wherein the left side elevational view is a mirror image thereof;

FIG. 3 is a left bottom perspective view of the mattress border of FIG.1; and,

FIG. 4 is a front elevational view of the mattress border of FIG. 1,wherein the rear elevational view is identical thereto.

The ornamental design for a mattress border, as shown and described.